The Metropolitan/Circle line Kings Cross station was a dual station that also served the City Widened lines (more recently taken over by Thameslink trains). It was situated to the east of its present location but the Metropolitan line part of it was moved
to allow a more convenient interchange with the deep level stations
and the main line station itself.
(The Widened lines / Thameslink part of the station remained operational until 2007, when it was relocated further to the north-west, under St. Pancras station)

Construction of the new Metropolitan line station was accomplished by
filling in the running tunnel to provide a concourse and diverting
the tracks into old tunnels that ran outside of and parallel
with the original running tunnels - the old tunnels were short
City Widened Lines westerly extensions beyond the junction where they veered
north to St.Pancras.

(This page deals only with the Metropolitan line part of the station. The Widened lines / Thameslink side is dealt with on its own page).

According to two ex-pats; Ian Simpson and Dewi Williams,
the western end of the replacement Kings Cross station had a
bay platform for terminating trains. It was of six-car length
but was rarely used as the norm was for eight-car trains after
the war. It remained until the 1960s but was mostly filled in,
leaving just the short section shown here.

The changing face of the old running tunnel at the replacement Kings Cross station: in the late 1970s
and (moving your cursor over the image) in 2006.

The old station looking west. The westbound platform is visible here but (most of) the eastbound platform was utilised for the Thameslink station next to these lines. The Thameslink station itself closed in 2007.

The old station looking west. The photo is taken from the eastbound platform, which used to also serve the northbound Widened lines.

View of the open air part of the old station, again from the eastbound platform but looking in the opposite direction from the photo above.

View of the stairs on the eastbound platform.

(Photo: 2008)

From the same position as the photo above but looking at the westbound platform area and its steps. The tracks are hidden by the cables in the foreground.

(Photo: 2008)

From the same position as the photo above but now looking straight down toward the scant remaining section of the eastbound platform.

(Photo: 2008)

Looking down at the eastbound platform from the top of the stairs.

(Photo: 2008)

View from the crossover bridge at the stairs leading down to the westbound platform on the left, and the subway under the road toward Kings Cross mainline station, on the right.